From a5e2cdc8265f52cd1fad393f2759b7f716a481d6 Mon Sep 17 00:00:00 2001
From: Yuri Artemev <i@artemeff.com>
Date: Wed, 20 Jul 2016 09:50:01 +0300
Subject: [PATCH 1/2] add config for suppress supervisors start/stop

---
 src/error_logger_lager_h.erl | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/error_logger_lager_h.erl b/src/error_logger_lager_h.erl
index 96e5d00..ce90fba 100644
--- a/src/error_logger_lager_h.erl
+++ b/src/error_logger_lager_h.erl
@@ -258,10 +258,15 @@ log_event(Event, #state{sink=Sink} = State) ->
                                     [App, Node])
                     end;
                 [{started, Started}, {supervisor, Name}] ->
-                    MFA = format_mfa(get_value(mfargs, Started)),
-                    Pid = get_value(pid, Started),
-                    ?LOGFMT(Sink, debug, P, "Supervisor ~w started ~s at pid ~w",
-                        [supervisor_name(Name), MFA, Pid]);
+                    case lager_app:get_env(lager, suppress_supervisor_start_stop, false) of
+                        true ->
+                            ok;
+                        _ ->
+                            MFA = format_mfa(get_value(mfargs, Started)),
+                            Pid = get_value(pid, Started),
+                            ?LOGFMT(Sink, debug, P, "Supervisor ~w started ~s at pid ~w",
+                                [supervisor_name(Name), MFA, Pid])
+                    end;
                 _ ->
                     ?LOGMSG(Sink, info, P, "PROGRESS REPORT " ++ print_silly_list(D))
             end;

From cd6c5c62dfaa9d56da0335233a81a73f3610e180 Mon Sep 17 00:00:00 2001
From: Yuri Artemev <i@artemeff.com>
Date: Wed, 27 Jul 2016 10:46:42 +0300
Subject: [PATCH 2/2] add note about suppressing app/sup logs

---
 README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.md b/README.md
index 7b6a370..d649259 100644
--- a/README.md
+++ b/README.md
@@ -652,6 +652,16 @@ You can also pass it to `erlc`, if you prefer:
 erlc -pa lager/ebin +'{parse_transform, lager_transform}' +'{lager_truncation_size, 1024}' file.erl
 ```
 
+Suppress applications and supervisors start/stop logs
+-----------------------------------------------------
+
+If you don't want to see supervisors and applications start/stop logs in debug level of your application, you can use these configs to turn it off:
+
+```erlang
+{lager, [{suppress_application_start_stop, true},
+         {suppress_supervisor_start_stop, true}]}
+```
+
 3.x Changelog
 -------------
 3.2.1 - 10 June 2016